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From "Stephen Yuan Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13254) EnableTableHandler#prepare would not throw TableNotFoundException during recovery
Date Mon, 16 Mar 2015 21:23:40 GMT
Stephen Yuan Jiang created HBASE-13254:
------------------------------------------

             Summary: EnableTableHandler#prepare would not throw TableNotFoundException during
recovery
                 Key: HBASE-13254
                 URL: https://issues.apache.org/jira/browse/HBASE-13254
             Project: HBase
          Issue Type: Bug
            Reporter: Stephen Yuan Jiang
            Assignee: Stephen Yuan Jiang
            Priority: Minor


During recovery, when EnableTableHandler#prepare() is called, If the table does not exist,
it marks the table as deleted and does NOT throw TableNotFoundException.  The result is that
the table lock is released and the caller has no knowledge that the table not exist or already
deleted, it would continue the next step.

{code}
  public EnableTableHandler prepare()
      throws TableNotFoundException, TableNotDisabledException, IOException {
   ...
    try {
      // Check if table exists
      if (!MetaTableAccessor.tableExists(this.server.getConnection(), tableName)) {
        // retainAssignment is true only during recovery.  In normal case it is false
        if (!this.skipTableStateCheck) {
          throw new TableNotFoundException(tableName);
        }
         this.assignmentManager.getTableStateManager().setDeletedTable(tableName);
      }
   ...
  }
{code}

However,look at the recovery code that calls the EnableTableHandler#prepare function, AssignmentManager#recoverTableInEnablingState()
expects TableNotFoundException so that it can skip the table.

{code}
  private void recoverTableInEnablingState()
          throws KeeperException, IOException {
    Set<TableName> enablingTables = tableStateManager.
            getTablesInStates(TableState.State.ENABLING);
    if (enablingTables.size() != 0) {
      for (TableName tableName : enablingTables) {
        // Recover by calling EnableTableHandler
        LOG.info("The table " + tableName
            + " is in ENABLING state.  Hence recovering by moving the table"
            + " to ENABLED state.");
        // enableTable in sync way during master startup,
        // no need to invoke coprocessor
        EnableTableHandler eth = new EnableTableHandler(this.server, tableName,
          this, tableLockManager, true);
        try {
          eth.prepare();
        } catch (TableNotFoundException e) {
          LOG.warn("Table " + tableName + " not found in hbase:meta to recover.");
          continue;
        }
        eth.process();
      }
    }
  }
{code}

The proposed fix is always throw TableNotFoundException in EnableTableHandler#prepare if the
table does not exist.



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